Mechanism of biological control to Anthracnoses in mango by antimicrobial cinnamaldehyde.
Liu Feng, Zhan RuLin, He YanBiao, Zhao YanLong, Yang ShunJin, Chang JinMei
Author Affiliation: South Asia Tropical Crop Research Institute, Chinese Academy of Tropical Agricultural Sciences, Key Laboratory for Post-harvest Physiology and Technology of Tropical Horticultural Products of Hainan Province, Zhanjiang, Guangdong 5240
Journal of Fruit Science 28 : 651-656
Abstract : Toxicity of antimicrobial cinnamaldehyde to Colletotrichum gloeosporioides of anthracnoses in mango was studied by plate growth rate method, the biocontrol efficiency of cinnamaldehyde was tested and the changes of defense enzyme activity were detected as well. The results showed that the control efficiency of cinnamaldehyde on mango anthracnoses was 56.67% under the concentration of 30 mg.L-1. The EC50 values on mycelial growth and conidium germination of C. gloeosporioides were 38.51 and 22.34 mg.L-1 respectively. Furthermore, the cinnamaldehyde could degrade the conidial cell wall and completely restrain the formation of spore when the concentration was higher than 40 mg.L-1. The results of physiological and biochemical test showed that after pathogen infected mango, O2-. and other reactive oxygen substance content increased. Cinnamicaldehyde could suppress and kill the bacteria, reduce the production of such material, and maintain the stability of defense enzymes. It could make the host maintain a normal physiological state to suppress and reduce the incidence of disease.